FYAF3045DNTU Equivalent & Substitute Parts

Part Overview

The FYAF3045DNTU is a Schottky diode array manufactured by onsemi, configured as 1 pair common cathode with a maximum reverse voltage of 45 V and average rectified current of 30 A per diode. The device is packaged in TO-3P-3 Full Pack for through-hole mounting applications. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. Substitute parts listed below maintain core electrical specifications while offering alternative packaging and active product status from current manufacturers.

Key Parameters

Parameter	Value
Diode Configuration	1 Pair Common Cathode
Technology	Schottky
Voltage - DC Reverse (Vr) (Max)	45 V
Current - Average Rectified (Io) (per Diode)	30 A
Voltage - Forward (Vf) (Max) @ If	700 mV @ 30 A
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Current - Reverse Leakage @ Vr	1 mA @ 45 V
Operating Temperature - Junction	-65°C ~ 150°C
Mounting Type	Through Hole
Package / Case	TO-3P-3 Full Pack
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the FYAF3045DNTU is determined by the following critical parameters:

Electrical Compatibility Requirements:

Diode configuration must be 1 pair common cathode
Technology must be Schottky
Voltage rating (Vr) must be 45 V or higher
Current rating (Io) must be 30 A or higher
Fast recovery speed characteristic (≤ 500 ns, > 200 mA)
Mounting type must be through hole

Acceptable Variations:

Package / case type may differ (TO-247-3 acceptable as alternative to TO-3P-3)
Forward voltage (Vf) may vary within typical Schottky diode ranges
Reverse leakage current may vary within acceptable limits
Operating temperature range may differ
Product status may be active (preferred over obsolete)

Substitute parts are grouped into two categories based on current rating alignment:

Category 1 - Full Current Rating Match (30 A): STPS60L45CW and MBR3035PT maintain the 30 A current specification.

Category 2 - Reduced Current Rating (15-20 A): STPS30L45CW, STPS4045CWY, and VS-30CPQ045-N3 provide lower current ratings and are suitable only for applications with reduced current requirements.

Parameter Comparison

Parameter	FYAF3045DNTU	STPS60L45CW	STPS4045CWY	STPS30L45CW	VS-30CPQ045-N3	MBR3035PT
Manufacturer	onsemi	STMicroelectronics	STMicroelectronics	STMicroelectronics	Vishay General Semiconductor	Solid State Inc.
Diode Configuration	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode
Technology	Schottky	Schottky	Schottky	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	45 V	45 V	45 V	45 V	45 V	35 V
Current - Average Rectified (Io) (per Diode)	30 A	30 A	20 A	15 A	15 A	30 A
Voltage - Forward (Vf) (Max) @ If	700 mV @ 30 A	550 mV @ 30 A	760 mV @ 20 A	550 mV @ 15 A	540 mV @ 15 A	Not Specified
Speed	Fast Recovery ≤ 500 ns, > 200 mA	Fast Recovery ≤ 500 ns, > 200 mA	Fast Recovery ≤ 500 ns, > 200 mA	Fast Recovery ≤ 500 ns, > 200 mA	Fast Recovery ≤ 500 ns, > 200 mA	Fast Recovery ≤ 500 ns, > 200 mA
Current - Reverse Leakage @ Vr	1 mA @ 45 V	1.5 mA @ 45 V	200 µA @ 45 V	400 µA @ 45 V	1.75 mA @ 45 V	Not Specified
Operating Temperature - Junction	-65°C ~ 150°C	150°C (Max)	-40°C ~ 175°C	150°C (Max)	-55°C ~ 150°C	Not Specified
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-3P-3 Full Pack	TO-247-3	TO-247-3	TO-247-3	TO-247-3	TO-247-3
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	Not Specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not Specified
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	Vendor Undefined

Engineering Selection Recommendations

Primary Substitute - Full Electrical Equivalence:

STPS60L45CW is the primary substitute for FYAF3045DNTU. This STMicroelectronics device maintains identical voltage (45 V) and current (30 A) ratings with matching fast recovery speed characteristics. The part is active in production status with ROHS3 compliance and REACH unaffected designation. Package transition from TO-3P-3 to TO-247-3 requires PCB layout modification but maintains electrical performance. Forward voltage is improved at 550 mV versus 700 mV, resulting in lower power dissipation.

Secondary Substitute - Current Rating Consideration:

MBR3035PT from Solid State Inc. provides 30 A current capability matching the original specification. However, the maximum reverse voltage is 35 V, which is 10 V below the FYAF3045DNTU rating. This part is suitable only for applications where the circuit operates at 35 V or lower. Product status is active with TO-247-3 packaging.

Reduced Current Alternatives:

STPS4045CWY, STPS30L45CW, and VS-30CPQ045-N3 are suitable only for applications requiring 20 A or 15 A respectively. These parts maintain the 45 V voltage rating and fast recovery characteristics but cannot support the full 30 A specification of the original device. STPS4045CWY includes automotive qualification (AEC-Q101) and extended temperature range (-40°C to 175°C), making it suitable for automotive applications with reduced current requirements.

Compliance Considerations:

All active substitute parts carry ROHS3 compliance and REACH unaffected status, supporting modern regulatory requirements. The original FYAF3045DNTU is classified as obsolete, necessitating transition to active alternatives for new designs and long-term supply assurance.

Frequently Asked Questions (FAQ)

Q: Can STPS60L45CW directly replace FYAF3045DNTU without circuit modification?

A: STPS60L45CW provides electrical equivalence in voltage, current, and speed characteristics. However, package transition from TO-3P-3 to TO-247-3 requires PCB layout modification. Pin configuration and thermal characteristics differ between packages, necessitating mechanical redesign of the mounting area.

Q: Why is MBR3035PT listed as a substitute if the voltage rating is only 35 V?

A: MBR3035PT is a valid substitute for applications operating at 35 V or lower. The 10 V voltage margin reduction limits its use to circuits with maximum operating voltage of 35 V. For circuits requiring the full 45 V rating, STPS60L45CW is the appropriate choice.

Q: Can STPS30L45CW or STPS4045CWY be used in place of FYAF3045DNTU?

A: These parts are suitable only if the application current requirement is 15 A or 20 A respectively. They cannot support the full 30 A specification of the original device. Current derating is required for safe operation.

Q: What is the impact of forward voltage differences between FYAF3045DNTU and STPS60L45CW?

A: STPS60L45CW exhibits 550 mV forward voltage at 30 A compared to 700 mV for FYAF3045DNTU. This 150 mV reduction results in lower power dissipation and improved thermal performance in the substitute device.

Q: Are all substitute parts RoHS compliant?

A: STPS60L45CW, STPS4045CWY, STPS30L45CW, and VS-30CPQ045-N3 are ROHS3 compliant. MBR3035PT RoHS status is not specified. Verify compliance requirements with your procurement department before selection.

Q: What is the difference between TO-3P-3 and TO-247-3 packages?

A: TO-3P-3 and TO-247-3 are both through-hole packages for power diodes but have different physical dimensions, pin spacing, and thermal characteristics. PCB footprint redesign is required when transitioning between these packages. Consult package datasheets for specific dimensional requirements.

Q: Is STPS4045CWY suitable for automotive applications?

A: STPS4045CWY carries AEC-Q101 automotive qualification and operates across -40°C to 175°C, making it suitable for automotive applications. However, the 20 A current rating limits its use to circuits with reduced current requirements compared to the original 30 A specification.

Q: What is the inventory status of substitute parts?

A: STPS4045CWY has 3400 units in stock, STPS30L45CW has 2600 units, VS-30CPQ045-N3 has 1841 units, STPS60L45CW has 1451 units, and MBR3035PT has 1947 units available as new original stock.

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